Abstract
The dry dense medium separation of aluminum and non-aluminum in waste mixed metals was investigated based on floating and sinking of metals in a gas-solid fluidized bed using steel shots as the fluidized medium. It was found that the different sized mixed metals are separated into aluminum as floater and non-aluminum as sinker when the air velocity and the float-sink time are suitably adjusted. The float-sink of smaller metals is largely affected by the air velocity and the float-sink time ; the floating of aluminum is dependent on bubbling at the fluidized bed surface, and the sinking of non-aluminum is correlated with apparent viscosity of the fluidized bed. Longer float-sink time is required for the smaller metals to be separated compared to larger metals, indicating that sizing of the mixed metals before the dry separation is important in light of economics of the processing time and recovery.
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